org.eclipse.swt.widgets.ToolItem.java Source code

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/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.widgets;

import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;

/**
 * Instances of this class represent a selectable user interface object
 * that represents a button in a tool bar.
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>PUSH, CHECK, RADIO, SEPARATOR, DROP_DOWN</dd>
 * <dt><b>Events:</b></dt>
 * <dd>Selection</dd>
 * </dl>
 * <p>
 * Note: Only one of the styles CHECK, PUSH, RADIO, SEPARATOR and DROP_DOWN
 * may be specified.
 * </p><p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 *
 * @see <a href="http://www.eclipse.org/swt/snippets/#toolbar">ToolBar, ToolItem snippets</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 * @noextend This class is not intended to be subclassed by clients.
 */
public class ToolItem extends Item {
    long arrowHandle, labelHandle, imageHandle;
    long eventHandle, proxyMenuItem, provider;
    ToolBar parent;
    Control control;
    Image hotImage, disabledImage;
    String toolTipText;
    boolean drawHotImage;

    /**
     * Constructs a new instance of this class given its parent
     * (which must be a <code>ToolBar</code>) and a style value
     * describing its behavior and appearance. The item is added
     * to the end of the items maintained by its parent.
     * <p>
     * The style value is either one of the style constants defined in
     * class <code>SWT</code> which is applicable to instances of this
     * class, or must be built by <em>bitwise OR</em>'ing together
     * (that is, using the <code>int</code> "|" operator) two or more
     * of those <code>SWT</code> style constants. The class description
     * lists the style constants that are applicable to the class.
     * Style bits are also inherited from superclasses.
     * </p>
     *
     * @param parent a composite control which will be the parent of the new instance (cannot be null)
     * @param style the style of control to construct
     *
     * @exception IllegalArgumentException <ul>
     *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
     * </ul>
     * @exception SWTException <ul>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
     *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
     * </ul>
     *
     * @see SWT#PUSH
     * @see SWT#CHECK
     * @see SWT#RADIO
     * @see SWT#SEPARATOR
     * @see SWT#DROP_DOWN
     * @see Widget#checkSubclass
     * @see Widget#getStyle
     */
    public ToolItem(ToolBar parent, int style) {
        super(parent, checkStyle(style));
        this.parent = parent;
        createWidget(parent.getItemCount());
    }

    /**
     * Constructs a new instance of this class given its parent
     * (which must be a <code>ToolBar</code>), a style value
     * describing its behavior and appearance, and the index
     * at which to place it in the items maintained by its parent.
     * <p>
     * The style value is either one of the style constants defined in
     * class <code>SWT</code> which is applicable to instances of this
     * class, or must be built by <em>bitwise OR</em>'ing together
     * (that is, using the <code>int</code> "|" operator) two or more
     * of those <code>SWT</code> style constants. The class description
     * lists the style constants that are applicable to the class.
     * Style bits are also inherited from superclasses.
     * </p>
     *
     * @param parent a composite control which will be the parent of the new instance (cannot be null)
     * @param style the style of control to construct
     * @param index the zero-relative index to store the receiver in its parent
     *
     * @exception IllegalArgumentException <ul>
     *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
     *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</li>
     * </ul>
     * @exception SWTException <ul>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
     *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
     * </ul>
     *
     * @see SWT#PUSH
     * @see SWT#CHECK
     * @see SWT#RADIO
     * @see SWT#SEPARATOR
     * @see SWT#DROP_DOWN
     * @see Widget#checkSubclass
     * @see Widget#getStyle
     */
    public ToolItem(ToolBar parent, int style, int index) {
        super(parent, checkStyle(style));
        this.parent = parent;
        int count = parent.getItemCount();
        if (!(0 <= index && index <= count)) {
            error(SWT.ERROR_INVALID_RANGE);
        }
        createWidget(index);
    }

    /**
     * Adds the listener to the collection of listeners who will
     * be notified when the control is selected by the user, by sending
     * it one of the messages defined in the <code>SelectionListener</code>
     * interface.
     * <p>
     * When <code>widgetSelected</code> is called when the mouse is over the arrow portion of a drop-down tool,
     * the event object detail field contains the value <code>SWT.ARROW</code>.
     * <code>widgetDefaultSelected</code> is not called.
     * </p>
     * <p>
     * When the <code>SWT.RADIO</code> style bit is set, the <code>widgetSelected</code> method is
     * also called when the receiver loses selection because another item in the same radio group
     * was selected by the user. During <code>widgetSelected</code> the application can use
     * <code>getSelection()</code> to determine the current selected state of the receiver.
     * </p>
     *
     * @param listener the listener which should be notified when the control is selected by the user,
     *
     * @exception IllegalArgumentException <ul>
     *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
     * </ul>
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     *
     * @see SelectionListener
     * @see #removeSelectionListener
     * @see SelectionEvent
     */
    public void addSelectionListener(SelectionListener listener) {
        checkWidget();
        if (listener == null)
            error(SWT.ERROR_NULL_ARGUMENT);
        TypedListener typedListener = new TypedListener(listener);
        addListener(SWT.Selection, typedListener);
        addListener(SWT.DefaultSelection, typedListener);
    }

    static int checkStyle(int style) {
        return checkBits(style, SWT.PUSH, SWT.CHECK, SWT.RADIO, SWT.SEPARATOR, SWT.DROP_DOWN, 0);
    }

    @Override
    protected void checkSubclass() {
        if (!isValidSubclass())
            error(SWT.ERROR_INVALID_SUBCLASS);
    }

    @Override
    void createHandle(int index) {
        state |= HANDLE;
        int bits = SWT.SEPARATOR | SWT.RADIO | SWT.CHECK | SWT.PUSH | SWT.DROP_DOWN;
        if ((style & SWT.SEPARATOR) == 0) {
            labelHandle = GTK.gtk_label_new_with_mnemonic(null);
            if (labelHandle == 0)
                error(SWT.ERROR_NO_HANDLES);
            imageHandle = GTK.gtk_image_new_from_pixbuf(0);
            if (imageHandle == 0)
                error(SWT.ERROR_NO_HANDLES);
        }
        switch (style & bits) {
        case SWT.SEPARATOR:
            handle = GTK.gtk_separator_tool_item_new();
            if (handle == 0)
                error(SWT.ERROR_NO_HANDLES);
            GTK.gtk_separator_tool_item_set_draw(handle, true);
            break;
        case SWT.DROP_DOWN:
            handle = GTK.gtk_menu_tool_button_new(0, null);
            if (handle == 0)
                error(SWT.ERROR_NO_HANDLES);
            /*
             * Feature in GTK. The arrow button of DropDown tool-item is
             * disabled when it does not contain menu. The fix is to
             * find the arrow button handle and enable it.
             */
            long child = GTK.gtk_bin_get_child(handle);
            long list = GTK.gtk_container_get_children(child);
            arrowHandle = OS.g_list_nth_data(list, 1);
            if (arrowHandle != 0) {
                GTK.gtk_widget_set_sensitive(arrowHandle, true);
            }
            break;
        case SWT.RADIO:
            /*
            * Because GTK enforces radio behavior in a button group
            * a radio group is not created for each set of contiguous
            * buttons, each radio button will not draw unpressed.
            * The fix is to use toggle buttons instead.
            */
        case SWT.CHECK:
            handle = GTK.gtk_toggle_tool_button_new();
            if (handle == 0)
                error(SWT.ERROR_NO_HANDLES);
            break;
        case SWT.PUSH:
        default:
            handle = GTK.gtk_tool_button_new(0, null);
            if (handle == 0)
                error(SWT.ERROR_NO_HANDLES);
            break;
        }
        if (labelHandle != 0) {
            GTK.gtk_tool_button_set_label_widget(handle, labelHandle);
        }
        if (imageHandle != 0) {
            GTK.gtk_tool_button_set_icon_widget(handle, imageHandle);
        }
        if ((parent.state & FONT) != 0) {
            setFontDescription(parent.getFontDescription());
        }
        /*
         * Feature in GTK. GtkToolButton class uses this property to
         * determine whether to show or hide its label when the toolbar
         * style is GTK_TOOLBAR_BOTH_HORIZ (or SWT.RIGHT).
         */
        if ((parent.style & SWT.RIGHT) != 0)
            GTK.gtk_tool_item_set_is_important(handle, true);
        if ((style & SWT.SEPARATOR) == 0)
            GTK.gtk_tool_button_set_use_underline(handle, true);
        /*
         * Set the "homogeneous" property to false, otherwise all ToolItems will be as large as
         * the largest one in the ToolBar. See bug 548331, 395296 for more information.
         */
        GTK.gtk_tool_item_set_homogeneous(handle, false);
    }

    @Override
    void createWidget(int index) {
        super.createWidget(index);
        showWidget(index);
        parent.relayout();
    }

    Widget[] computeTabList() {
        if (isTabGroup()) {
            if (getEnabled()) {
                if ((style & SWT.SEPARATOR) != 0) {
                    if (control != null)
                        return control.computeTabList();
                } else {
                    return new Widget[] { this };
                }
            }
        }
        return new Widget[0];
    }

    @Override
    void deregister() {
        super.deregister();
        if (eventHandle != 0)
            display.removeWidget(eventHandle);
        if (arrowHandle != 0)
            display.removeWidget(arrowHandle);
    }

    @Override
    public void dispose() {
        if (isDisposed())
            return;
        ToolBar parent = this.parent;
        super.dispose();
        parent.relayout();
    }

    /**
     * Returns a rectangle describing the receiver's size and location
     * relative to its parent.
     *
     * @return the receiver's bounding rectangle
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public Rectangle getBounds() {
        checkWidget();
        return DPIUtil.autoScaleDown(getBoundsInPixels());
    }

    Rectangle getBoundsInPixels() {
        checkWidget();
        parent.forceResize();
        long topHandle = topHandle();
        GtkAllocation allocation = new GtkAllocation();
        GTK.gtk_widget_get_allocation(topHandle, allocation);
        int x = allocation.x;
        int y = allocation.y;
        int width = allocation.width;
        int height = allocation.height;
        if ((parent.style & SWT.MIRRORED) != 0)
            x = parent.getClientWidth() - width - x;
        if ((style & SWT.SEPARATOR) != 0 && control != null)
            height = Math.max(height, 23);
        return new Rectangle(x, y, width, height);
    }

    /**
     * Returns the control that is used to fill the bounds of
     * the item when the item is a <code>SEPARATOR</code>.
     *
     * @return the control
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public Control getControl() {
        checkWidget();
        return control;
    }

    /**
     * Returns the receiver's disabled image if it has one, or null
     * if it does not.
     * <p>
     * The disabled image is displayed when the receiver is disabled.
     * </p>
     *
     * @return the receiver's disabled image
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public Image getDisabledImage() {
        checkWidget();
        return disabledImage;
    }

    /**
     * Returns <code>true</code> if the receiver is enabled, and
     * <code>false</code> otherwise. A disabled control is typically
     * not selectable from the user interface and draws with an
     * inactive or "grayed" look.
     *
     * @return the receiver's enabled state
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     *
     * @see #isEnabled
     */
    public boolean getEnabled() {
        checkWidget();
        long topHandle = topHandle();
        return GTK.gtk_widget_get_sensitive(topHandle);
    }

    /**
     * Returns the receiver's hot image if it has one, or null
     * if it does not.
     * <p>
     * The hot image is displayed when the mouse enters the receiver.
     * </p>
     *
     * @return the receiver's hot image
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public Image getHotImage() {
        checkWidget();
        return hotImage;
    }

    /**
     * Returns the receiver's parent, which must be a <code>ToolBar</code>.
     *
     * @return the receiver's parent
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public ToolBar getParent() {
        checkWidget();
        if (parent == null)
            error(SWT.ERROR_WIDGET_DISPOSED);
        return parent;
    }

    /**
     * Returns <code>true</code> if the receiver is selected,
     * and false otherwise.
     * <p>
     * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
     * it is selected when it is checked (which some platforms draw as a
     * pushed in button). If the receiver is of any other type, this method
     * returns false.
     * </p>
     *
     * @return the selection state
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public boolean getSelection() {
        checkWidget();
        if ((style & (SWT.CHECK | SWT.RADIO)) == 0)
            return false;
        return GTK.gtk_toggle_tool_button_get_active(handle);
    }

    /**
     * Returns the receiver's tool tip text, or null if it has not been set.
     *
     * @return the receiver's tool tip text
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public String getToolTipText() {
        checkWidget();
        return toolTipText;
    }

    /**
     * Gets the width of the receiver.
     *
     * @return the width
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public int getWidth() {
        checkWidget();
        return DPIUtil.autoScaleDown(getWidthInPixels());
    }

    int getWidthInPixels() {
        checkWidget();
        parent.forceResize();
        long topHandle = topHandle();
        GtkAllocation allocation = new GtkAllocation();
        GTK.gtk_widget_get_allocation(topHandle, allocation);
        return allocation.width;
    }

    @Override
    long gtk_event(long widget, long event) {
        if (!GTK.GTK4)
            return 0;
        int eventType = GDK.gdk_event_get_event_type(event);
        switch (eventType) {
        case GDK.GDK4_BUTTON_PRESS: {
            return gtk_button_press_event(widget, event);
        }
        case GDK.GDK4_BUTTON_RELEASE: {
            return gtk_button_release_event(widget, event);
        }
        }
        return 0;
    }

    @Override
    long gtk_button_press_event(long widget, long event) {
        return parent.gtk_button_press_event(widget, event);
    }

    @Override
    long gtk_button_release_event(long widget, long event) {
        return parent.gtk_button_release_event(widget, event);
    }

    @Override
    long gtk_clicked(long widget) {
        Event event = new Event();
        if ((style & SWT.DROP_DOWN) != 0) {
            long eventPtr = GTK.gtk_get_current_event();
            if (eventPtr != 0) {
                int eventType = GDK.gdk_event_get_event_type(eventPtr);
                eventType = Control.fixGdkEventTypeValues(eventType);
                long topHandle = topHandle();
                switch (eventType) {
                case GDK.GDK_KEY_RELEASE: //Fall Through..
                case GDK.GDK_BUTTON_PRESS:
                case GDK.GDK_2BUTTON_PRESS:
                case GDK.GDK_BUTTON_RELEASE: {
                    boolean isArrow = false;
                    if (widget == arrowHandle) {
                        isArrow = true;
                        topHandle = widget;
                        /*
                         * Feature in GTK. ArrowButton stays in toggled state if there is no popup menu.
                         * It is required to set back the state of arrow to normal state after it is clicked.
                         */
                        OS.g_signal_handlers_block_matched(widget, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CLICKED);
                        GTK.gtk_toggle_button_set_active(widget, false);
                        OS.g_signal_handlers_unblock_matched(widget, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CLICKED);
                    }
                    if (isArrow) {
                        event.detail = SWT.ARROW;
                        GtkAllocation allocation = new GtkAllocation();
                        GTK.gtk_widget_get_allocation(topHandle, allocation);
                        event.x = DPIUtil.autoScaleDown(allocation.x);
                        if ((style & SWT.MIRRORED) != 0)
                            event.x = DPIUtil.autoScaleDown(parent.getClientWidth() - allocation.width) - event.x;
                        event.y = DPIUtil.autoScaleDown(allocation.y + allocation.height);
                    }
                    break;
                }
                }
                gdk_event_free(eventPtr);
            }
        }
        if ((style & SWT.RADIO) != 0) {
            if ((parent.getStyle() & SWT.NO_RADIO_GROUP) == 0) {
                selectRadio();
            }
        }
        sendSelectionEvent(SWT.Selection, event, false);
        return 0;
    }

    @Override
    long gtk_create_menu_proxy(long widget) {
        /*
         * Feature in GTK. If the item is a radio/check button
         * with only image, then that image does not appear in
         * the overflow menu.
         * The fix is to create and use the proxy menu for the
         * items appearing in the overflow menu.
         */
        byte[] buffer = Converter.wcsToMbcs("menu-id", true); //$NON-NLS-1$
        if (proxyMenuItem != 0) {
            /*
             * The menuItem to appear in the overflow menu is cached
             * for the tool-item. If the text/image of the item changes,
             * then the proxyMenu is reset.
             */
            GTK.gtk_tool_item_set_proxy_menu_item(widget, buffer, proxyMenuItem);
            return 1;
        }

        if (image != null) {
            ImageList imageList = parent.imageList;
            if (imageList != null) {
                int index = imageList.indexOf(image);
                if (index != -1) {
                    long pixbuf = imageList.getPixbuf(index);
                    byte[] label = null;
                    int[] showImages = new int[] { 1 };
                    /*
                     * GTK tool items with only image appear as blank items
                     * in overflow menu when the system property "gtk-menu-images"
                     * is set to false. To avoid that, display the tooltip text
                     * if available, in the overflow menu.
                     * Feature in GTK. When the menuItem is initialised only
                     * with the image, the overflow menu appears very sloppy.
                     * The fix is to initialise menu item with empty string.
                     */
                    if (text == null || text.length() == 0) {
                        if ((showImages[0] == 0) && (toolTipText != null))
                            label = Converter.wcsToMbcs(toolTipText, true);
                        else
                            label = new byte[] { 0 };
                    } else {
                        label = Converter.wcsToMbcs(text, true);
                    }
                    long menuItem = GTK.gtk_menu_item_new();
                    if (menuItem == 0)
                        error(SWT.ERROR_NO_HANDLES);

                    long boxHandle = gtk_box_new(GTK.GTK_ORIENTATION_HORIZONTAL, false, 6);
                    if (boxHandle == 0)
                        error(SWT.ERROR_NO_HANDLES);

                    long menuLabel = GTK.gtk_accel_label_new(label);
                    if (menuLabel == 0)
                        error(SWT.ERROR_NO_HANDLES);
                    if (GTK.GTK_VERSION >= OS.VERSION(3, 16, 0)) {
                        GTK.gtk_label_set_xalign(labelHandle, 0);
                        GTK.gtk_widget_set_halign(labelHandle, GTK.GTK_ALIGN_FILL);
                    } else {
                        GTK.gtk_misc_set_alignment(labelHandle, 0, 0);
                    }

                    long menuImage = GTK.gtk_image_new_from_pixbuf(pixbuf);
                    if (menuImage == 0)
                        error(SWT.ERROR_NO_HANDLES);

                    GTK.gtk_container_add(boxHandle, menuImage);
                    gtk_box_pack_end(boxHandle, menuLabel, true, true, 0);
                    GTK.gtk_container_add(menuItem, boxHandle);
                    GTK.gtk_tool_item_set_proxy_menu_item(widget, buffer, menuItem);

                    /*
                     * Since the arrow button does not appear in the drop_down
                     * item, we request the menu-item and then, hook the
                     * activate signal to send the Arrow selection signal.
                     */
                    proxyMenuItem = GTK.gtk_tool_item_get_proxy_menu_item(widget, buffer);
                    OS.g_signal_connect(menuItem, OS.activate, ToolBar.menuItemSelectedFunc.getAddress(), handle);
                    return 1;
                }
            }
        }
        return 0;
    }

    void gtk_css_provider_load_from_css(long context, String css) {
        /* Utility function. */
        //@param css : a 'css java' string like "{\nbackground: red;\n}".
        if (provider == 0) {
            provider = GTK.gtk_css_provider_new();
            GTK.gtk_style_context_add_provider(context, provider, GTK.GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
            OS.g_object_unref(provider);
        }
        if (GTK.GTK4) {
            GTK.gtk_css_provider_load_from_data(provider, Converter.wcsToMbcs(css, true), -1);
        } else {
            GTK.gtk_css_provider_load_from_data(provider, Converter.wcsToMbcs(css, true), -1, null);
        }
    }

    @Override
    long gtk_enter_notify_event(long widget, long event) {
        parent.gtk_enter_notify_event(widget, event);
        drawHotImage = (parent.style & SWT.FLAT) != 0 && hotImage != null;
        if (drawHotImage) {
            ImageList imageList = parent.imageList;
            if (imageList != null) {
                int index = imageList.indexOf(hotImage);
                if (index != -1 && imageHandle != 0) {
                    long pixbuf = imageList.getPixbuf(index);
                    gtk_image_set_from_gicon(imageHandle, pixbuf);
                }
            }
        }
        return 0;
    }

    @Override
    long gtk_event_after(long widget, long gdkEvent) {
        int eventType = GDK.gdk_event_get_event_type(gdkEvent);
        eventType = Control.fixGdkEventTypeValues(eventType);
        switch (eventType) {
        case GDK.GDK_BUTTON_PRESS: {
            int[] eventButton = new int[1];
            GDK.gdk_event_get_button(gdkEvent, eventButton);
            if (eventButton[0] == 3) {
                double[] eventRX = new double[1];
                double[] eventRY = new double[1];
                GDK.gdk_event_get_root_coords(gdkEvent, eventRX, eventRY);
                parent.showMenu((int) eventRX[0], (int) eventRY[0]);
            }
            break;
        }
        }
        return 0;
    }

    @Override
    long gtk_focus_in_event(long widget, long event) {
        parent.hasChildFocus = true;
        parent.currentFocusItem = this;
        return 0;
    }

    @Override
    long gtk_focus_out_event(long widget, long event) {
        parent.hasChildFocus = false;
        return 0;
    }

    @Override
    long gtk_leave_notify_event(long widget, long event) {
        parent.gtk_leave_notify_event(widget, event);
        if (drawHotImage) {
            drawHotImage = false;
            if (image != null) {
                ImageList imageList = parent.imageList;
                if (imageList != null) {
                    int index = imageList.indexOf(image);
                    if (index != -1 && imageHandle != 0) {
                        long pixbuf = imageList.getPixbuf(index);
                        gtk_image_set_from_gicon(imageHandle, pixbuf);
                    }
                }
            }
        }
        return 0;
    }

    @Override
    long gtk_map(long widget) {
        parent.fixZOrder();
        return 0;
    }

    @Override
    long gtk_mnemonic_activate(long widget, long arg1) {
        return parent.gtk_mnemonic_activate(widget, arg1);
    }

    @Override
    void hookEvents() {
        super.hookEvents();
        if ((style & SWT.SEPARATOR) != 0)
            return;
        OS.g_signal_connect_closure(handle, OS.clicked, display.getClosure(CLICKED), false);
        /*
         * Feature in GTK. GtkToolItem does not respond to basic listeners
         * such as button-press, enter-notify to it. The fix is to assign
         * the listener to child (GtkButton) of the tool-item.
         */
        eventHandle = GTK.gtk_bin_get_child(handle);
        if ((style & SWT.DROP_DOWN) != 0) {
            long list = GTK.gtk_container_get_children(eventHandle);
            eventHandle = OS.g_list_nth_data(list, 0);
            if (arrowHandle != 0)
                OS.g_signal_connect_closure(arrowHandle, OS.clicked, display.getClosure(CLICKED), false);
        }
        OS.g_signal_connect_closure(handle, OS.create_menu_proxy, display.getClosure(CREATE_MENU_PROXY), false);
        if (GTK.GTK4) {
            long keyController = GTK.gtk_event_controller_key_new();
            GTK.gtk_widget_add_controller(eventHandle, keyController);
            GTK.gtk_event_controller_set_propagation_phase(keyController, GTK.GTK_PHASE_TARGET);

            long focusAddress = display.focusCallback.getAddress();
            OS.g_signal_connect(keyController, OS.focus_in, focusAddress, FOCUS_IN);
            OS.g_signal_connect(keyController, OS.focus_out, focusAddress, FOCUS_OUT);

            long motionController = GTK.gtk_event_controller_motion_new();
            GTK.gtk_widget_add_controller(eventHandle, motionController);
            GTK.gtk_event_controller_set_propagation_phase(motionController, GTK.GTK_PHASE_TARGET);

            long enterAddress = display.enterMotionScrollCallback.getAddress();
            long leaveAddress = display.leaveCallback.getAddress();
            OS.g_signal_connect(motionController, OS.enter, enterAddress, ENTER);
            OS.g_signal_connect(motionController, OS.leave, leaveAddress, LEAVE);
        } else {
            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[FOCUS_IN_EVENT], 0,
                    display.getClosure(FOCUS_IN_EVENT), false);
            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[FOCUS_OUT_EVENT], 0,
                    display.getClosure(FOCUS_OUT_EVENT), false);

            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[ENTER_NOTIFY_EVENT], 0,
                    display.getClosure(ENTER_NOTIFY_EVENT), false);
            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[LEAVE_NOTIFY_EVENT], 0,
                    display.getClosure(LEAVE_NOTIFY_EVENT), false);
        }
        /*
        * Feature in GTK.  Usually, GTK widgets propagate all events to their
        * parent when they are done their own processing.  However, in contrast
        * to other widgets, the buttons that make up the tool items, do not propagate
        * the mouse up/down events. It is interesting to note that they DO propagate
        * mouse motion events.  The fix is to explicitly forward mouse up/down events
        * to the parent.
        */
        int mask = GDK.GDK_EXPOSURE_MASK | GDK.GDK_POINTER_MOTION_MASK | GDK.GDK_BUTTON_PRESS_MASK
                | GDK.GDK_BUTTON_RELEASE_MASK | GDK.GDK_ENTER_NOTIFY_MASK | GDK.GDK_LEAVE_NOTIFY_MASK
                | GDK.GDK_KEY_PRESS_MASK | GDK.GDK_KEY_RELEASE_MASK | GDK.GDK_FOCUS_CHANGE_MASK;
        GTK.gtk_widget_add_events(eventHandle, mask);
        if (GTK.GTK4) {
            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[EVENT], 0, display.getClosure(EVENT),
                    false);
        } else {
            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[BUTTON_PRESS_EVENT], 0,
                    display.getClosure(BUTTON_PRESS_EVENT), false);
            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[BUTTON_RELEASE_EVENT], 0,
                    display.getClosure(BUTTON_RELEASE_EVENT), false);
        }
        if (GTK.GTK4) {
            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[EVENT], 0, display.getClosure(EVENT),
                    false);
        } else {
            OS.g_signal_connect_closure_by_id(eventHandle, display.signalIds[EVENT_AFTER], 0,
                    display.getClosure(EVENT_AFTER), false);
        }

        long topHandle = topHandle();
        OS.g_signal_connect_closure_by_id(topHandle, display.signalIds[MAP], 0, display.getClosure(MAP), true);
    }

    /**
     * Returns <code>true</code> if the receiver is enabled and all
     * of the receiver's ancestors are enabled, and <code>false</code>
     * otherwise. A disabled control is typically not selectable from the
     * user interface and draws with an inactive or "grayed" look.
     *
     * @return the receiver's enabled state
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     *
     * @see #getEnabled
     */
    public boolean isEnabled() {
        checkWidget();
        return getEnabled() && parent.isEnabled();
    }

    boolean isTabGroup() {
        ToolItem[] tabList = parent._getTabItemList();
        if (tabList != null) {
            for (int i = 0; i < tabList.length; i++) {
                if (tabList[i] == this)
                    return true;
            }
        }
        if ((style & SWT.SEPARATOR) != 0)
            return true;
        int index = parent.indexOf(this);
        if (index == 0)
            return true;
        ToolItem previous = parent.getItem(index - 1);
        return (previous.getStyle() & SWT.SEPARATOR) != 0;
    }

    @Override
    void register() {
        super.register();
        if (eventHandle != 0)
            display.addWidget(eventHandle, this);
        if (arrowHandle != 0)
            display.addWidget(arrowHandle, this);
    }

    @Override
    void releaseHandle() {
        super.releaseHandle();
        arrowHandle = labelHandle = imageHandle = eventHandle = 0;
    }

    @Override
    void releaseWidget() {
        super.releaseWidget();
        if (parent.currentFocusItem == this)
            parent.currentFocusItem = null;
        parent = null;
        control = null;
        hotImage = disabledImage = null;
        toolTipText = null;
    }

    /**
     * Removes the listener from the collection of listeners who will
     * be notified when the control is selected by the user.
     *
     * @param listener the listener which should no longer be notified
     *
     * @exception IllegalArgumentException <ul>
     *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
     * </ul>
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     *
     * @see SelectionListener
     * @see #addSelectionListener
     */
    public void removeSelectionListener(SelectionListener listener) {
        checkWidget();
        if (listener == null)
            error(SWT.ERROR_NULL_ARGUMENT);
        if (eventTable == null)
            return;
        eventTable.unhook(SWT.Selection, listener);
        eventTable.unhook(SWT.DefaultSelection, listener);
    }

    void resizeControl() {
        if (control != null && !control.isDisposed()) {
            /*
            * Set the size and location of the control
            * separately to minimize flashing in the
            * case where the control does not resize
            * to the size that was requested.  This
            * case can occur when the control is a
            * combo box.
            */
            Rectangle itemRect = getBounds();
            control.setSize(itemRect.width, itemRect.height);
            resizeHandle(itemRect.width, itemRect.height);
            Rectangle rect = control.getBounds();
            rect.x = itemRect.x + (itemRect.width - rect.width) / 2;
            rect.y = itemRect.y + (itemRect.height - rect.height) / 2;
            control.setLocation(rect.x, rect.y);
        }
    }

    void resizeHandle(int width, int height) {
        GTK.gtk_widget_set_size_request(handle, width, height);
        /*
        * Cause a size allocation this widget's topHandle.  Note that
        * all calls to gtk_widget_size_allocate() must be preceded by
        * a call to gtk_widget_size_request().
        */
        GtkRequisition requisition = new GtkRequisition();
        parent.gtk_widget_get_preferred_size(handle, requisition);
        GtkAllocation allocation = new GtkAllocation();
        GTK.gtk_widget_get_allocation(handle, allocation);
        allocation.width = width;
        allocation.height = height;
        GTK.gtk_widget_size_allocate(handle, allocation);
    }

    void selectRadio() {
        int index = 0;
        ToolItem[] items = parent.getItems();
        while (index < items.length && items[index] != this)
            index++;
        int i = index - 1;
        while (i >= 0 && items[i].setRadioSelection(false))
            --i;
        int j = index + 1;
        while (j < items.length && items[j].setRadioSelection(false))
            j++;
        setSelection(true);
    }

    /**
     * Sets the control that is used to fill the bounds of
     * the item when the item is a <code>SEPARATOR</code>.
     *
     * @param control the new control
     *
     * @exception IllegalArgumentException <ul>
     *    <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li>
     *    <li>ERROR_INVALID_PARENT - if the control is not in the same widget tree</li>
     * </ul>
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public void setControl(Control control) {
        checkWidget();
        if (control != null) {
            if (control.isDisposed())
                error(SWT.ERROR_INVALID_ARGUMENT);
            if (control.parent != parent)
                error(SWT.ERROR_INVALID_PARENT);
        }
        if ((style & SWT.SEPARATOR) == 0)
            return;
        if (this.control == control)
            return;
        this.control = control;
        parent.relayout();
    }

    /**
     * Sets the receiver's disabled image to the argument, which may be
     * null indicating that no disabled image should be displayed.
     * <p>
     * The disabled image is displayed when the receiver is disabled.
     * </p>
     *
     * @param image the disabled image to display on the receiver (may be null)
     *
     * @exception IllegalArgumentException <ul>
     *    <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
     * </ul>
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public void setDisabledImage(Image image) {
        checkWidget();
        if ((style & SWT.SEPARATOR) != 0)
            return;
        disabledImage = image;
    }

    /**
     * Enables the receiver if the argument is <code>true</code>,
     * and disables it otherwise.
     * <p>
     * A disabled control is typically
     * not selectable from the user interface and draws with an
     * inactive or "grayed" look.
     * </p>
     *
     * @param enabled the new enabled state
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public void setEnabled(boolean enabled) {
        checkWidget();
        long topHandle = topHandle();
        if (GTK.gtk_widget_get_sensitive(topHandle) == enabled)
            return;
        GTK.gtk_widget_set_sensitive(topHandle, enabled);
    }

    boolean setFocus() {
        return GTK.gtk_widget_child_focus(handle, GTK.GTK_DIR_TAB_FORWARD);
    }

    void setFontDescription(long font) {
        if (labelHandle != 0)
            setFontDescription(labelHandle, font);
    }

    void setForegroundRGBA(GdkRGBA rgba) {
        if (labelHandle != 0)
            setForegroundRGBA(labelHandle, rgba);
    }

    void setBackgroundRGBA(GdkRGBA rgba) {
        if (handle != 0)
            setBackgroundRGBA(handle, rgba);
    }

    void setBackgroundRGBA(long handle, GdkRGBA rgba) {
        if (GTK.GTK_VERSION >= OS.VERSION(3, 14, 0)) {
            // Form background string
            long context = GTK.gtk_widget_get_style_context(handle);
            String name = GTK.GTK_VERSION >= OS.VERSION(3, 20, 0) ? display.gtk_widget_class_get_css_name(handle)
                    : display.gtk_widget_get_name(handle);
            String css = name + " {background-color: " + display.gtk_rgba_to_css_string(rgba) + "}";

            // Apply background color and any foreground color
            gtk_css_provider_load_from_css(context, css);
        }
    }

    void setForegroundRGBA(long handle, GdkRGBA rgba) {
        if (GTK.GTK_VERSION < OS.VERSION(3, 14, 0)) {
            GdkRGBA selectedForeground = display.COLOR_LIST_SELECTION_TEXT_RGBA;
            GTK.gtk_widget_override_color(handle, GTK.GTK_STATE_FLAG_NORMAL, rgba);
            GTK.gtk_widget_override_color(handle, GTK.GTK_STATE_FLAG_SELECTED, selectedForeground);
            long context = GTK.gtk_widget_get_style_context(handle);
            GTK.gtk_style_context_invalidate(context);
            return;
        }
        GdkRGBA toSet = new GdkRGBA();
        if (rgba != null) {
            toSet = rgba;
        } else {
            toSet = display.COLOR_WIDGET_FOREGROUND_RGBA;
        }
        long context = GTK.gtk_widget_get_style_context(handle);
        // Form foreground string
        String color = display.gtk_rgba_to_css_string(toSet);
        String css = "* {color: " + color + ";}";

        // Cache and apply foreground color
        parent.cssForeground = css;
        gtk_css_provider_load_from_css(context, css);

        // We need to set the parent ToolBar's background
        // otherwise setting the foreground will wipe it out.
        parent.restoreBackground();
    }

    /**
     * Sets the receiver's hot image to the argument, which may be
     * null indicating that no hot image should be displayed.
     * <p>
     * The hot image is displayed when the mouse enters the receiver.
     * </p>
     *
     * @param image the hot image to display on the receiver (may be null)
     *
     * @exception IllegalArgumentException <ul>
     *    <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
     * </ul>
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public void setHotImage(Image image) {
        checkWidget();
        if ((style & SWT.SEPARATOR) != 0)
            return;
        hotImage = image;
        if (image != null) {
            ImageList imageList = parent.imageList;
            if (imageList == null)
                imageList = parent.imageList = new ImageList();
            int imageIndex = imageList.indexOf(image);
            if (imageIndex == -1) {
                imageIndex = imageList.add(image);
            } else {
                imageList.put(imageIndex, image);
            }
        }
    }

    @Override
    public void setImage(Image image) {
        checkWidget();
        if ((style & SWT.SEPARATOR) != 0)
            return;
        super.setImage(image);
        if (image != null) {
            ImageList imageList = parent.imageList;
            if (imageList == null)
                imageList = parent.imageList = new ImageList();
            int imageIndex = imageList.indexOf(image);
            if (imageIndex == -1) {
                imageIndex = imageList.add(image);
            } else {
                imageList.put(imageIndex, image);
            }
            long pixbuf = imageList.getPixbuf(imageIndex);
            gtk_image_set_from_gicon(imageHandle, pixbuf);
        } else {
            gtk_image_set_from_gicon(imageHandle, 0);
        }
        /*
        * If Text/Image of a tool-item changes, then it is
        * required to reset the proxy menu. Otherwise, the
        * old menuItem appears in the overflow menu.
        */
        if ((style & SWT.DROP_DOWN) != 0) {
            proxyMenuItem = 0;
            proxyMenuItem = GTK.gtk_tool_item_retrieve_proxy_menu_item(handle);
            OS.g_signal_connect(proxyMenuItem, OS.activate, ToolBar.menuItemSelectedFunc.getAddress(), handle);
        }
        parent.relayout();
    }

    @Override
    void setOrientation(boolean create) {
        if ((parent.style & SWT.RIGHT_TO_LEFT) != 0 || !create) {
            int dir = (parent.style & SWT.RIGHT_TO_LEFT) != 0 ? GTK.GTK_TEXT_DIR_RTL : GTK.GTK_TEXT_DIR_LTR;
            if (handle != 0)
                GTK.gtk_widget_set_direction(handle, dir);
        }
    }

    boolean setRadioSelection(boolean value) {
        if ((style & SWT.RADIO) == 0)
            return false;
        if (getSelection() != value) {
            setSelection(value);
            sendSelectionEvent(SWT.Selection);
        }
        return true;
    }

    /**
     * Sets the selection state of the receiver.
     * <p>
     * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
     * it is selected when it is checked (which some platforms draw as a
     * pushed in button).
     * </p>
     *
     * @param selected the new selection state
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public void setSelection(boolean selected) {
        checkWidget();
        if ((style & (SWT.CHECK | SWT.RADIO)) == 0)
            return;
        OS.g_signal_handlers_block_matched(handle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CLICKED);
        GTK.gtk_toggle_tool_button_set_active(handle, selected);
        OS.g_signal_handlers_unblock_matched(handle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CLICKED);
    }

    @Override
    boolean setTabItemFocus(boolean next) {
        return setFocus();
    }

    /**
     * Sets the receiver's text. The string may include
     * the mnemonic character.
     * <p>
     * Mnemonics are indicated by an '&amp;' that causes the next
     * character to be the mnemonic.  When the user presses a
     * key sequence that matches the mnemonic, a selection
     * event occurs. On most platforms, the mnemonic appears
     * underlined but may be emphasised in a platform specific
     * manner.  The mnemonic indicator character '&amp;' can be
     * escaped by doubling it in the string, causing a single
     * '&amp;' to be displayed.
     * </p><p>
     * Note: If control characters like '\n', '\t' etc. are used
     * in the string, then the behavior is platform dependent.
     * </p>
     *
     * @param string the new text
     *
     * @exception IllegalArgumentException <ul>
     *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
     * </ul>
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    @Override
    public void setText(String string) {
        checkWidget();
        if (string == null)
            error(SWT.ERROR_NULL_ARGUMENT);
        if ((style & SWT.SEPARATOR) != 0)
            return;
        if (string.equals(this.text))
            return;
        super.setText(string);
        if (labelHandle == 0)
            return;
        char[] chars = fixMnemonic(string);
        byte[] buffer = Converter.wcsToMbcs(chars, true);
        GTK.gtk_label_set_text_with_mnemonic(labelHandle, buffer);
        /*
        * If Text/Image of a tool-item changes, then it is
        * required to reset the proxy menu. Otherwise, the
        * old menuItem appears in the overflow menu.
        */
        if ((style & SWT.DROP_DOWN) != 0) {
            proxyMenuItem = 0;
            proxyMenuItem = GTK.gtk_tool_item_retrieve_proxy_menu_item(handle);
            OS.g_signal_connect(proxyMenuItem, OS.activate, ToolBar.menuItemSelectedFunc.getAddress(), handle);
        }
        parent.relayout();
    }

    /**
     * Sets the receiver's tool tip text to the argument, which
     * may be null indicating that the default tool tip for the
     * control will be shown. For a control that has a default
     * tool tip, such as the Tree control on Windows, setting
     * the tool tip text to an empty string replaces the default,
     * causing no tool tip text to be shown.
     * <p>
     * The mnemonic indicator (character '&amp;') is not displayed in a tool tip.
     * To display a single '&amp;' in the tool tip, the character '&amp;' can be
     * escaped by doubling it in the string.
     * </p>
     * <p>
     * NOTE: This operation is a hint and behavior is platform specific, on Windows
     * for CJK-style mnemonics of the form " (&amp;C)" at the end of the tooltip text
     * are not shown in tooltip.
     * </p>
     *
     * @param string the new tool tip text (or null)
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public void setToolTipText(String string) {
        checkWidget();
        if (toolTipText == string || (toolTipText != null && toolTipText.equals(string)))
            return;
        if (parent.toolTipText == null) {
            Shell shell = parent._getShell();
            setToolTipText(shell, string);
        }
        toolTipText = string;
        /*
        * Since tooltip text of a tool-item is used in overflow
        * menu when images are not shown, it is required to
        * reset the proxy menu when the tooltip text changes.
        * Otherwise, the old menuItem appears in the overflow
        * menu as a blank item.
        */
        if ((style & SWT.DROP_DOWN) != 0) {
            proxyMenuItem = 0;
            proxyMenuItem = GTK.gtk_tool_item_retrieve_proxy_menu_item(handle);
            OS.g_signal_connect(proxyMenuItem, OS.activate, ToolBar.menuItemSelectedFunc.getAddress(), handle);
        }
    }

    void setToolTipText(Shell shell, String newString) {
        long child = GTK.gtk_bin_get_child(handle);
        if ((style & SWT.DROP_DOWN) != 0) {
            long list = GTK.gtk_container_get_children(child);
            child = OS.g_list_nth_data(list, 0);
            if (arrowHandle != 0)
                shell.setToolTipText(arrowHandle, newString);
        }
        shell.setToolTipText(child != 0 ? child : handle, newString);
    }

    /**
     * Sets the width of the receiver, for <code>SEPARATOR</code> ToolItems.
     *
     * @param width the new width. If the new value is <code>SWT.DEFAULT</code>,
     * the width is a fixed-width area whose amount is determined by the platform.
     * If the new value is 0 a vertical or horizontal line will be drawn, depending
     * on the setting of the corresponding style bit (<code>SWT.VERTICAL</code> or
     * <code>SWT.HORIZONTAL</code>). If the new value is <code>SWT.SEPARATOR_FILL</code>
     * a variable-width space is inserted that acts as a spring between the two adjoining
     * items which will push them out to the extent of the containing ToolBar.
     *
     *
     * @exception SWTException <ul>
     *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
     *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
     * </ul>
     */
    public void setWidth(int width) {
        checkWidget();
        setWidthInPixels(DPIUtil.autoScaleUp(width));
    }

    void setWidthInPixels(int width) {
        checkWidget();
        if ((style & SWT.SEPARATOR) == 0)
            return;
        if (width < 0)
            return;
        resizeHandle(width, (parent.style & SWT.VERTICAL) != 0 ? 6 : 15);
        parent.relayout();
    }

    void showWidget(int index) {
        if (handle != 0)
            GTK.gtk_widget_show(handle);
        if (labelHandle != 0)
            GTK.gtk_widget_show(labelHandle);
        if (imageHandle != 0)
            GTK.gtk_widget_show(imageHandle);
        GTK.gtk_toolbar_insert(parent.handle, handle, index);
    }
}